Diaryl-monoindolyl-methane dyestuffs



Patented Mar. 18, 1941 PATENT OFFICE I DIARYL-MONOINDOLYL-METHANE DYESTUFF Paul Herbert Wolff, deceased, late of Frankforton-the-Main-Hochst, Germany,

administrator, Germany,

Wenzel, Main-Ho'chst,

by Richard Frankforton-theand Karl Frank,

lfrankfort-on-the-Main-Hochst, Germany, asslgnors to General Aniline & Film Corporation, a corporation of Delaware No Drawing. Application December 21, 1938, Serial No. 247,052. In Germany May 3, 1938 4 Claims.

The present invention relates to diaryl-monoindolyl-methane dyestufis. t

verted in substance or on the fiber. into complex metal compounds, are made by condensing a 4'-halogenbenzophenone-3-hydroxy-4-carboxylic acid with an indole compound which contains in its alpha-position an aryl group of the benzene series, for instance by heating the reagents in the presence of a diluent and an acid condensing agent, sulfonating the condensation product thus obtainedthe latter process step may also be performed simultaneously with the condensation by using an agent having a condensing and sulfonating action-and finally exchanging the reactive halogen atom in the product for a primary or secondary aromatic amine radical of the benzene series. Alternatively, the sulfa-nation may be performed after the exchange of the halogen atom for an aromatic amine radical.

The present invention comprises new dyestuffs, for instance those of the general formula:

SOaH

for protecting the amino-group and the methyl group is then oxidized by means of potassium permanganate in a neutral aqueous solution to form the carboxylic acid. After saponification of the acetylamino-group the amino-group is exchanged according to known methods for the hydroxy-group. The corresponding 4-bromo-compound may be prepared in a similar manner.

The following examples serve to illustrate the invention, but they are not intended to limit it thereto; the parts are by Weight:

(1) 276.5 parts of 4-chloro-3-hydroxybenzophenone-i-carboxyllc acid are condensed with 207 parts of l-methyl-Z-phenylindolc in 3000 parts of alcoholic hydrochloric acid by heating to boiling for a short time, for instance for half an hour, in a reflux apparatus. The condensation product is isolated by precipitation with water. It is then dried and sulfonated at 25 C. with 10 times its weight of fuming sulfuric acid containing 10 per cent of sulfuric anhy-dride. The free sulfonic acid is dried and melted with 3 times its weight of para-phenetidine at about 70 C. for about one hour. The excess of para-phenetidine is removed by stirring with dilute hydrochloric acid and the dyestuff is then isolated in the form of the sodium salt. It dyes wool green tints which when after-chromed acquire a fuller shade and have distinctly improved fastness properties.

(2) By replacing the para-phenetidine used for exchanging the reactive chlorine in Example 1 by N-methyl-para-phenetidine a similar dyestuff is obtained which dyes wool yellowish green shades which may be after-chromed with immovement of their fastness properties.

(3) 276.5 parts of 4-chloro-3-hydroxybenzophenone-l-carboxylic acid are condensed with 311.5 parts of l-isobuty1-2-parachlorophenyl- 4.6- dimethylindole in 2000 parts of chlorosulfonic acid and 800 parts of fuming sulfuric acid containing about 3 per cent of sulfuric anhydride by heating at 50 C. for 24 hours, simultaneous sulfonation occurring. The sulfonic acid is dried and melted, analogously to Example 1, with 3 and have distinctly improved fastness properties.

3. The compound of the formula:

times its weight of N-methyl-para-anisidine at C. for half an hour. In the form of the so dium salt, the new dyestufi dyes wool in an acid OH: OH 011 bath green tints Whose fastness properties are improved by after-chroming. (MING C C00};a 5

(4) By replacing in the foregoing examples the 4'- chloro 3 hydroxy-benzophenone-l-cars 03H boxylic acid by the corresponding 4-bromo-compound, the same dyestuffs are obtained. I

We claim: CH@ 10 1. The compounds of the general formula: 4

H: OH X OH I being a dyestufl which dyes wool yellowish green alkyl O C COONa shadeswhich may be after-chromed with improvement of their fastness properties. 15 80,11 4. The compound of the formula:

OH; OH OH ,l l

alkyl CH: S 0311 wherein X represents a member of the group 7 l 1 consisting of hydrogen and alkyl and R represents a mononuclear aryl radical. I r 2. The compound of the formula: C

OH OH N I CH: C2H5O-C -NH-OO o 0 ONa Cm being a dyestufi which dyes wool in an acid bath yellowish green tints Whose fastness properties are improved by after-chroming.

' RICHARD WENZEL,

Administrator of the Estate of Paul Herbert Wolfi, Deceased.

being a dyestuff which dyes wool green tints which when after-chromed acquire a fuller shade KARL FRANK. 

